My first image

This is the first pixel image I've every done, using Pyxel Edit. It's a very basic scene that probably has a lot of flaws, so I would appreciate as much feedback as possible. I just looked up a forum post summing everything to do with pixel art and then tried applying it as best as I could.

I've also provided the Pyxel Edit file for anyone who wants to examine it in further detail. Just ignore my use of layers, I really didn't take advantage of it and felt it wasn't necessary for this project.